Grid isn't drawn in latest Firefox

[Radobilly]

Although i think the issue is related to the latest Firefox version i'd like to point out that the grid isn't drawn in Firefx 59.0.1
Older versions, before Firefox Quantum, seems to work fine.

[kinimesi]

@Radobilly I just tried the demo in Firefox 59.0.1 (Linux), it works as expected.

Edit: grid is not drawn in Firefox 59.0.1, guidelines works properly.

[kinimesi]

@Radobilly should be fixed in unstable branch. Can you verify and close? Thanks. Demo

[Radobilly]

Yepp, that solved the issue, thanks! Awesome fix, you rock! <3